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/*
Copyright (C) 2009 RedHat inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "abrtlib.h"
/* If s is a string with only printable ASCII chars
* and has no spaces, ", ', and \, copy it verbatim.
* Else, encapsulate it in single quotes, and
* encode ', " and \ with \c escapes.
* Control chars are encoded as \r, \n, \t, or \xNN.
* In all cases, terminating NUL is added
* and the pointer to it is returned.
*/
static char *append_escaped(char *start, const char *s)
{
char *dst = start;
const unsigned char *p = (unsigned char *)s;
while (1)
{
const unsigned char *old_p = p;
while (*p > ' ' && *p <= 0x7e && *p != '\"' && *p != '\'' && *p != '\\')
p++;
if (dst == start)
{
if (p != (unsigned char *)s && *p == '\0')
{
/* entire word does not need escaping and quoting */
strcpy(dst, s);
dst += strlen(s);
return dst;
}
*dst++ = '\'';
}
strncpy(dst, (char *)old_p, (p - old_p));
dst += (p - old_p);
if (*p == '\0')
{
*dst++ = '\'';
*dst = '\0';
return dst;
}
char hex_char_buf[5];
const char *a;
switch (*p)
{
case '\r': a = "\\r"; break;
case '\n': a = "\\n"; break;
case '\t': a = "\\t"; break;
case '\'': a = "\\\'"; break;
case '\"': a = "\\\""; break;
case '\\': a = "\\\\"; break;
case ' ': a = " "; break;
default:
/* Build \xNN string */
hex_char_buf[0] = '\\';
hex_char_buf[1] = 'x';
hex_char_buf[2] = "0123456789abcdef"[*p >> 4];
hex_char_buf[3] = "0123456789abcdef"[*p & 0xf];
hex_char_buf[4] = '\0';
a = hex_char_buf;
}
strcpy(dst, a);
dst += strlen(a);
p++;
}
}
static char* get_escaped(const char *path, char separator)
{
char *escaped = NULL;
int fd = open(path, O_RDONLY);
if (fd >= 0)
{
char *dst = NULL;
unsigned total_esc_len = 0;
while (total_esc_len < 1024 * 1024) /* paranoia check */
{
/* read and escape one block */
char buffer[4 * 1024 + 1];
int len = read(fd, buffer, sizeof(buffer) - 1);
if (len <= 0)
break;
buffer[len] = '\0';
/* string CC can expand into '\xNN\xNN' and thus needs len*4 + 3 bytes,
* including terminating NUL.
* We add +1 for possible \n added at the very end.
*/
escaped = xrealloc(escaped, total_esc_len + len*4 + 4);
char *src = buffer;
dst = escaped + total_esc_len;
while (1)
{
/* escape till next NUL char */
char *d = append_escaped(dst, src);
total_esc_len += (d - dst);
dst = d;
src += strlen(src) + 1;
if ((src - buffer) >= len)
break;
*dst++ = separator;
}
}
if (dst)
{
if (separator == '\n')
*dst++ = separator;
*dst = '\0';
}
close(fd);
}
return escaped;
}
char* get_cmdline(pid_t pid)
{
char path[sizeof("/proc/%lu/cmdline") + sizeof(long)*3];
sprintf(path, "/proc/%lu/cmdline", (long)pid);
return get_escaped(path, ' ');
}
char* get_environ(pid_t pid)
{
char path[sizeof("/proc/%lu/environ") + sizeof(long)*3];
sprintf(path, "/proc/%lu/environ", (long)pid);
return get_escaped(path, '\n');
}
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